Mercedes-Benz Forum - View Single Post - Help!2002 c240 newly replaced key fob won't unlock ignition
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post #4 of (permalink) Old 09-19-2015, 07:30 PM
rudeney
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Date registered: Dec 2004
Vehicle: CURRENT: 2011 SL550, 2010 ML350 FORMER: 2007 CLK550 Cabriolet, 2002 C240, 2001 ML320, 1984 300TD
Location: Birmingham, AL
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It sounds like the dealer sold you a "replacement" key that, when used, will reprogram the EIS to cancel out the old, broken key. Since you 2nd original key still works, you have not "crashed" the WIS. I assume you paid the dealer for a service visit for them to diagnose the bad key and order the new one? What I would do is forget about the "replacement" key and just order an "extra" key. It will com pre-programmed and ready to use with no "download' necessary for the EIS.

BTW, this "programming" that the replacement key does should take about 2 seconds. The dealer not handing this for you is poor service. And even to tell you to go home and keep trying is even worse! I see if they will cover the price of the "extra" key. If you need more details about this, I can describe it, but the DAS (Drive Authorization System) and handling replacement vs. extra keys is not rocket science, but it does take a bit of logic to understand.

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